Excluding directly to a computer load his iPhone or iPad this only with 0.5 A (2.5W). That is so slow that the devices themselves do not show charging (but takes place). In other adapters 2.7V and 2.0V are applied to the data pins, so that 1 A is flowing. For even faster charging of the iPad can be loaded iPad with 1.5 A (7.5W) with this adapter (risk of overloading the computer included). For me it works on all computers and notebooks (tested with 'USB Port Monitor Digital multimeter voltage tester voltmeter', which I can highly recommend). Regardless of computers solves these adapters certainly one or the other Inkomptibilitätsproblem with chargers or Lipo-USB batteries and various terminals.